Rotary plugging tool



H. LENTULO' ROTARY PLUGGING TOOL Aug. 14, 1934.

Filed April 2, 1952 Patented Aug. 14, 1934 a; a e w 'f v normy'rwoome'roon ParisFmice ApplicationAp'rll 251932, Serial Ne. 602,694

' *InFranceDecember 14, 1 931 a a a '3H1 1 K v h P esent, inventionfreiatesto rotary plug-. a chuck c. The latter can'bemounte d in v E ging'tools'ffor' thejintroduction of plastic mate; the usual way in a-TSLIPPQrting hand p'iece' d, rials i'nto' cavitieshaving}narrowopenings. jllt Figure 2, attheend of the 'fiexible'shaft eof; is morejparticularlyintended for uselin the art thedental engine or the like.

. of dentistry for'thev luggingor stoppingiofjdental The general shape of the instrument il 3 cements and vane-us plastic materials intended heloffa tooth;

channela' as described in my 'p'rior U. 8., A". Patent sponds approximately tothe shape of the space 137711182, issued July 22nd," 19,30.,', f I I tobe filled with the pastymaterial, cement, etc This plugging tool is employed in dentistry as as will' he seen from Figure 2, which represents an instrument for the introduction of-pastes, he rotary plugger introducedinto the root'chan"- for the, stopping oflcavities having narrow mouths 'The"wire "coil is was ,;wound" helically around orforifices;especiallyfthe' fro'ot ohannelsornerve anv imaginary'core ior fsubstantially the whole cavitiesof teethvwhich'have suffered partial lde- 01 its length; terminating "in a slightly drawn; structio'n,iintentionalor spontaneous, of the vasg outcoil; not clearly "defined "asa geometrical cular jand'nervous matterlvvhichno'rmally filled spiral; so that th e point did not always fulfil 7 e .Y v its purpose 'of 'transpor'tingthe plastic'mate'rial ".The presjentinvention consists of an'improved to "the very end otjthecavity in the tooth'T; rotar'y pluggingtool, characterized in 'tliatfthe Unless thecavity was sufliciently wide to admit wire of which it is formed einstead of being the coil j"almost up to the apex of theroot,

them.

. wound helically. around a theoretical, core for or at least suflicier'itly wide to admit a dental 75 the ,whole of its length and. beinglo'f" circular broach for clearing and "enlarging the cavity-to cross section as far aslits extremity; asiri the re'ceijvethe coil j, there would remain a narrow rotary plugging to'ol of 'myprio'r '--invention, is extremity channel (often of capillary dimen so. constituted as 'to' receive in' th' terminal por sions) unfilled with the plastic material and 5 tionjont'vard from the point where its'th'ickne'ss therefore liable-toharbour iniective'matter and is"suffitiientlirf,reduced, asuitable angular cross; micro-organisms entering from'the apex." sectiombemg at "the same time twistedaround The improved rotaryplugger (see Figure- 3) is its axisrwithout any theoretical or' ima;ginary formed' from a thin metallicrwire aof-circular core; thisconstruction allows the; introduction cross-section,-"of a diameter of approximately 30 of. the improved instrument as far' as, the very some hundredths'of a millimetrawhich diameter 5 end of thefcavity 'to be filled without any p'redecreases gradually towards thefreeend or point, liminary opening outorjbroa'ching ofthisjfcavity the other endflor shank a being secured in a and provides for surejand certainpropul'sion of chuckf c which can clampedinthe hand-piece the filling or. stopping materialfasjufa'r as the 11 m any suitable mannerfas in the case' of my extreme limit ofthe' cavity. prior invention; The chuck cis therefore shown The invention is hereafter'described with ref indotted lines in Figure 3, toindicate that, the erence to the acccmpanying' drayvingJin' whichf mode of drive may'remainunchanged: 1 ill Figurelrepresentsla rotary plugging to'ol made The wire :1 is 'vvou'ridhelic'ally .to asvaryin inaccordance'with'myprior Patent l,77l,l8'2 ;an d pitch around a theoretical .core, the diameter .49 mounted in a chuck for driving purposes. of which varieslikewisegso that it: is not con- 5 Figure 2 illustratesthe' application of the instantly'cylindricalwbutiassumesgenerally a tastrument'to a tooth, sho'\vn"on"an enlarged scale. peringconical shape like .arat-tail, the widest -Figure 3 're'presentsthe improved-plugging tool part being at-the base adjacent to the shank a according to the presentinvention; this figure 1 Moreover, as will be seen from Figure 3, the

5 beinga greatly enlarged view of the working improved rotaryplugger comprises; two ,asso- 7100 length'of the instrument..' i ci-atecl partsz. v v Figures rand '5ill'ustratein cross section suit- (1-) A first portion generally indicated as A, ableformations -for;the pointlsection oi. the imconstitutedby-the metal wire a of tapering cirproved plugging tool. cular cross-section, coiledin aspir'al upon an .---As shown-in Figure'l, the rotary pluggingtool imaginary core, like the point section of-the ro- 5 of my-vpriorjpatent specificationcomprised;aheli tary ,plugger in-.my.- previous invention; and of coidal coil of wire secured to or integral with trunco-conical' shape es-indicated bythe chain ashank or mandrelM intendedto'transmitthe "lines .r m and yyf; and rotarydrive received fromja dentallngine'or (2)- A seoond portion or point sectiom genenally .55 e nei a h ea Mb ng'heldf fi emele am e d l iiee e aa m mei no though of extremely smalldi-mensions', o'ftenjdoes a prolongation of the part A; this portion B instead of having the shape of a final drawn-out coil as in the instrument described in my aforementioned prio-r specification, is constituted by the twisted extremity of the wire a of the section A, to which there is given a suitable angular (i. e. non-circular) cross section for example square (b, Fig. 4),, triangular ib' 5): or other. The alteration of or'oss-sectidn and the change from spiral coiling to twisting, at thejunctionof the two portions or sections A B will be seen to begin from the point Where the thicknessbr overall diameter is sufiiciently reducedtoi-allowg; introduction into root channels of minimum dinlensio a... I;

In this second section B:-,. -the w ire is mere ly twisted around its axis zz in thetsame 'direcei tion or hand as the spiral coiling of the portion A, but without being coiled around more, and the cornersoi the angular cross-section are ,.ex posed while the sides, or the" cross;section form helical flutes in which the plastic material collectsj Thus the point. section Bhasjnoiinal 'drawnbut (:oil like my-previousiinstrument, but has the twist continued right .up to the }extremity,,- vvhich enables 'itTto. 'act"as"means for transporting the plastic inaterial intogthe-very end of thefcavity when introduced 'into'the root channel ota tooth 30 TV as in thecase of Figure 2., Moreover sincezthe point, section i s'lof f less diameterithan the s'ir'iall end of the coil, "it can be passed muchjfurthe'r into thecavity; iniactthefpoint section'can be introduced just as far s, a dental broach of equal size, so that thepreli'rn inary widening out o f the cavity 'by the removal'of sound material is ren dered. unnecessary. 3 I If. I

The plugger being givena movement of rapid rotation, by means of the ordinary dental en'- gine, while supportedinthe hand-piece d, the stopping material will Ebe'propelled-into the channel by the combined action of .the two portions or sections A B. f

It may be pointed out that the root channel to be filled is practically closed at its apical extremity so that at mostthe stoppingmaterial will only be propelled. as far as theinstrilment penetrates; beyond that point; theair remain ing between theextremity of the rotary plug ger and the apical end; t thechannel wil-l oppose the'intrusion of the stopping material. a

Rotary plugging tools cannot therefore possess theirgmaximum efficiency unless they can bein- ,troduced right up to the end. of thecavities to be mensicms of the channel andthe hardness of the wallsl It f o1loyvs;therefore thatthe rotary plugger described in my iprio rspecificatiom 'al not reach the e d of the channel tobe filled; t results for the reason explained above that there is a fault or gap in the plugging, at the very region where this defect is most formidable.

The present invention provides an instrument consisting of a rotary plugger of improved type, which enables the dentist to introducethe paste, cement or the like with absolute certainty into the entire, length of the root channeLwithout it being-necessary first to widen out the apical extremity of the latter, and the principal condition upon--which the efliciency of the apparatus depends, is thus fulfilled without encountering the great difliculties explained above.

The twisted shapegiven to the wire in the portionB, allows, by reason of its tenuity or thinness;' the introduction of this portion B as tar as the very bottom of. the root channel of the tooth under-treatment, whatever be the shape and the fineness oi the channel, and without any preliminarybroaching or widening of'this channel.

On theother hand, after the paste or, cement has been propelled by 'thecoiledportion A of the instrument as in my previous "rotarypluggentlie twisted portion'B continues this propulsion of the material'with certaintyas far as the'extreme limit of the cavity, thetwisting'oi the wire which constitutes this portion Bjbeing' continued right up to its extremity withoutany break. I

Consequently the improved rotary plugging tool as herein described provides effective means for attaining the objectsexplainejd. above. It willbe evident that the use of theinvention is not limited to dental purposes, but that-the improved plug": ging'to'ol may be employed for the filling or introduction of plastic materials into cavities'in general; where the mouth or'opening is narrow so that difli culty is met with ensuringthe penetrationoi'the material tofthe bottom of the cavity;

' What I claim is: "A rotary plugging tool of the character de scribed, comprising a wire coiled for aportion of its length as a tapering helix and twisted for another portion of its lengthin the same direction around itsown axis, said twistedfportionbebeing coiled to a tapering helix having its axisjin prolongation-of. theaxis of said shank, and'an extremital portion of said wire twisted around its own axis, said extremital portion' being of angular floss-section and twisted to term flutes of the same handas said tapering helix and'havingits axis normally'in prolongation oi'the axisoi, said helix.

3. A rotary: dental plugging tool,- comprising' a point section, a shank,.a ncl an intermediatevpore tion, all made from a continuous length of fine wire, said point section being of non-circular cross-section andtwisted about its own axis, said shank being adapted for receiving rotary motion, andv said intermediate portion being coiled to a tapering helix of the same hand as the twist or said point section with its smaller'end adjacent to said point sectionandits larger end adjacent to said shank, said point section having its axis normally in prolongation otthe' axes'of saidfshank and of said intermediate portion but being fiexible to follow theshape of a dental cavity,' into which plastic material will-be 'fed by rotary movement 1'50 smaller end thereof, said point section being of angular cross-section, twisted around its axis to form helical flutes of the same hand as said helix, said point section being of a diameter not exceeding half the smallest diameterof said helix.

HENRI LENTULO. 

